I agree with you. Any break through is nice, but when they find a way to use waste (which is plentiful), that's when I will get really excited. The point of living green is to save the planet. Having to cut down trees to grow things for these bio fuels really is defeating the purpose. The trees filter out harmful gases and give us oxygen, they also attract rain. I believe that a portion of global warming is caused by too little trees and too much concrete. It's much cooler in the shade than on a sidewalk.